Installed a comfort ease pump a few months back, customer said it worked great. Got a call from him last week, said t&p was leaking. I went out checked the water pressure 60 p.s.i. replaced t&p and seemed ok. Heater is two years old. He called back this morning said it was leaking again. The heater does not have an expansion tank, so maybe due to thermal expansion? I have installed dozens of these on heaters without expansion tanks with no problem, why this time?